Intel's new Xeon 5300 processors, I'm impressed

As a software kind of guy, I tend to think processors are something that just run your code, but with today's pace of technology leaps inside processors (think multi-core, for instance) it is hard to ignore these achievements. For example, I must say I'm pretty impressed with Intel's latest server processor announcement: the Xeon processor 5300 series. This is a quad-core beast, but with about 50% less of energy consumption than previous models. I wouldn't mind seeing processor and PC technology to get even greener than it is currently. I read somewhere that the new Xeon 5300 chips wouldn't run 64-bit code, but I find that somewhat hard to believe. Let me know if you know the answer.